Counterboring tool



Jan. 1.2, 1932. E. osTLlND 1,840,736

COUNTERBORING TOOL Y Filed Dec. is, 195o 2 sheets-sheet 1 2 f7; ,yl- Zsl' jr 49 5l .J lg;- l 5l i lI l 36 5,6 n 4 I a I l 'l1y 3@ 45 45 H WW 42 1M 4l 3? lflqm 'r -av sa 26. y

6 i Il.A

l2 '7. l EDWARD OSTLIND.

` H/s AqTTOR/YEX Jan. 12,1932.- E. @sm-ND n 1,840,736

COUNTERBORING TOOL Filed Dec. 13, 195o 2 sheets-sheet 2 f ls Afro/Map I Patented Jan. 12, 1932 @NIT-:sn STATES EDWARD os'rLrivn,V or OAKLANDQCAJLIFORNIA A ooUNrEaBoRINGmooI. l Y

Application :filed December 13,1930. Serial No'. 5022103.

@My invention relatesto improvements in "tools for counter-boring the cylinders of 1nternal 'combustion engines and the like,

' wherein a sh'aft'is rigidly clamped within a '1 -54 cylinder bore of an engine 1n coaxial relation Y quent-ly causing an annoying knock in thel to the bore, 'the shaft being provided with an'adjustably mounted cutter head having a cutter to counter-bore the cylinder. y

' The cylinders :of internal combustion 'en- 'gines are -fs'ub'ject to wear by the yconstant vmovement -of the pistons and pistonV rings therein. *This wear results in producing a slight'shoulder within the cylinder at the uppermost end of the vpiston stroke and in the plane of the uppermost point reached bythe top of the uppermost piston ring. It is coinmon tocompensate for the wear upon the piston rings and cylinders by inserting rnew rings upon the pistons.v the new rings being usuallymade slightly oversize. -VVhensuch rings are inserted, the new rings strike the shoulders worn bythe previousrings, freengine and seriously impairing the efficiency of the rings and of the engine. This is sometimes corrected by reboring the cylinders to a l uniform oversize and thenv installing v oversize pistons and rings. This means of correction,'h'ow`ever, is costly and unless'the reboring is` done with extreme care and accuracy,y

frequently lfails to accomplish its purpose and injures, rather than improves,the engine. My presentl invention is, therefore, directed toan improved tool wherebygthe; unworn shoulder at the top of Van engine cylinder bore may be easily and accurately removed.

'Another object is topr'ovi'de an improved counter-boring tool which may be easily and accurately adjusted to counter-boreany desired amount'at the top of an engine cylinder;

Afurtherobject is to providean improved tool which will :facilitate the mounting and centering ofa cutter relative to a` cylinder bore to be counterfbored. j

'Another object is to Vprovide `an improved tool wherein the cuttergcarrying-shaft is rig# idly clamped within, and in co-aXial relation to the cylinder bore, and which will facilitate the `operation offa cutter 'within ,theiupper end of said bore.`

taken upon ythe line 2-2 ofFig.,'1 'inthe di and Y provided Witha'squared end 4to-receive a Afurther obj ect is to provide lan improved 'tool of thecharacter described having simple and improved means'for mounting and adjusting a cutter-'head and for operating said inder bore. l Y 'A further object is -to. provide'asimple and compact reboring tool which is handoperated and which' may Vbe efficientlyoperated with-V out dismounting'the cylinder block. 60

Astill further object is to provide an improved device of the character described embodying *improved features of construction and arrangement affording simplicity, economy; and leliciency in manufacture and in operation. Y f A p I accomplishthese and othervobjectslby means of the improved device disclosed in the drawings forminga part of the present ap plication wherein like characters -of reference are yused `to 'designate similar parts throughout the specification and drawings, f andin'whichz-Lll f Fig. l is a side elevation of my improved counter-boring'tool, `parts being broken away and shown insection;= Y n f l VFig. 2vishaverticalsection'of the tool as y applied to rebore a cylinder, theA section being rection indicated; f Y -v v 80 lFig. 3 is a plan view ofthe tool 'asv shown in'Fig.1 'v" ,V- Fig.V 4 is' a sectional detail ofthe mounting-and adjustingmeans; y

F'g. 5 is a; broken transverse sectional view taken upon the line 5'-5,of Fig. lin the dii rectionjindicated; Y v 1' Y Fig. '6 is a broken' vertical sectional view showing 1a modified form of the mechanism` for'fclampingthe tool within a cylinder bore;

cutter Fig. 7 is a transversesectional view taken uponl the line 7 7 of Fig. 6in the direction indicated.'- y l Referring to the drawings, thefn'ume'ral l is used'to designate in general va shaft member having a threaded portion 2 and provided with a key-way 3 longitudinally'disposed at one end of the shaft member. rvThe shaft 1 is vcutterA head to counter-bore the end of a cyly wrench or other tool by which the shaft may be rotated.

A pair of flange members 6 and 7 are rotatably mounted upon the shaft. The flange member 6 seats against a. collar 5 carried by the shaft, and the members 6 and 7 are held rigidly in spaced relation by means of a plurality of spacing rods 8 having reduced ends extending through the ange` members and tapped to receive nuts 9. The flange member 7 is engaged by a shoulder 11 formed upon a bushing 12 threaded or otherwise secured upon the threaded end of the shaft to form a bearing for the shaft and to retain the flange members in assembled relation upc-n the shaft. f

A pair of wedge members 14 and 15 are mounted upon the shaft between the flange members 6 and 7. The members 14 and 15 `are apertured, as at 16, to slidably engage the spacing rods 8, said rods serving as guides and operating to prevent rotation of the wedge members relative to the shaft 1. The wedge member 15 is ,internally threaded to engage the. threads of the threaded shaft portion 2 whereby rotation of the shaft within the wedge member operates to impart axial movement to the wedge member along the shaft. The wedge members 14 and 15 are provided with a plurality of matching recesses 17 having the backs of the recess-es machined to form wedge faces 18.

A plurality of clamping members 19 are mounted in engagement with the recesses 17 said members 19 having angularly disposed faces 21 seating against the wedge faces 18. A spring 22 having its ends joined to form a continuous loop extends around the members 19 andis received wit-hin notches 23 formed in the edges thereof. The members 19 are symmetrically disposed around the shaft and the faces 21 and 18 are so arranged thatr an axial movement of the member 16 toward the member 14 will force the clamping members 19 radially outwardly from the axis of the shaft 1.

A cutter-head mounting member designated in general by the. numeral 26 is removably and adjustably mounted upon the end .fr ofl the shaft having the key-way 3. The member 26 consists of a langedike body having a threaded extension 27 axially bored to form a neat t upon the shaft 1, the member 26 being assembled upon the shaft 1 with the extension 27 extending away from the -clamping mechanism hereinabove described.

A key 28 is! slidably mounted upon the member 26. The key 28 is normally moved inwardly to an operative position by a spring 29, the inner end jof the key memberbeing movable to engage thel key-way 3 to prevent rotation of the member 26 upon the shaft 1, and alsobeing arranged to engage any of a plurality of recesses 31 formed inv spaced relation within the back of the .key-way to prevent longitudinal movement of the member 26 along the shaft. The key member 28 is provided with a. head 32 having an aperture 33 therein to receive a pin 34 carried by the member 26 when the key is in operative position, the head being outwardly movable past the pin 34 and being arranged to be turned with the aperture 33 out of alinement with the pin whereby the key may be held outwardly in an inoperative position when desired.

A cutter-head designated in general by the numeral 36 is internally threaded to engage the threaded extension 27 of the mounting member. The cutter-head comprises a hollow cylindrical body closed at one end and provided with a squared extension 37 to receive a wrench or other tool by which the head may be turned upon the threaded mounting member. provided with a laterally disposed cutter arm 38 upon which is adjustably mounted a Cutter carrier 39. A cutter 41 is mounted upon the carrier 39, the cutting edge of the cutter 41 being disposed substantially opposite to the axis of the shaft 1 and head 36. The carrier is adjustable along the arm 38 by means of an adjusting screw 42 secured against longitudinal movement within the arm by means of a member 43 engaging an annular groove 44 formed in the screw member. The screw 42 engages an extension 46 carried by the carrier 39 and extending upwardly into a slot 47 extending longitudinally of the arm .38. A calibrated head 48 is carried by the screw whereby the screw may be turned to adjust the position of the carrier and the cutter whereby the cutter 41 may be set to cut along a circular path ofdesired radius.

The closed end of the carrier-head is drilled and tapped to receive a stop-screw 49 threaded therethrough. The head of the screw 49 is disposed upon the inner .side of the closed end, and the screw extends outwardly past the end of thev squared extension 37. A jamb-nut 51 is threaded onto the outwardly extending end of the screw 49, and a slot 52 is formed in the end of the `screw whereby the screw may be adjusted to position the inner end of the screw at a desired position to limit the movement of the carrier head as hereinafter more fully explained.

ln Figures 6 and 7 I have illustrated a modified form of the clamping means. In this construction, pins `53 are slidably mounted in the walls of cup shaped mounting members 54 carried by the shaft 1. The

pins are symmetrically disposed about the shaft 1 and are normally moved inwardly by springs 56. The wedge members 14 and 15 are arranged to engage the inner ends of the pins 53, and as said members 14 and 15 are moved toward each other the pins are forced The cutter-head 36 isllt ' forced outwardly into contact with the walls of the cylinder bore, a wrench or other suitable tool being applied to obtain a proper tightening of the clamping members against the cylinder wall to rigidly clamp Vthe device to the cylinder block with the shaft 1 extending axially upwardly from the top of the cylinder bore. In the clamping mechanism shown in Figs. 1 and 2, a rotation of the shaft 1 in a clockwise direction causes the wedge member 15 to be moved upwardly along the threaded portion 2 of the shaft 1. As the member 15 is moved upwardly, the wedge faces 18 and 21 cause the several members 19 to be pressed radially outwardly equally upon all sides of the shaft, thereby accurately. centering the shaft within `the cylinder bore and effectually clamping the shaft in operative position.

In the modified structure shown in Figs. 6 and 7, the clockwise rotation of the shaft first moves the wedge member 15 upwardly until thepins 53 engaged thereby are pressed outwardly to engage the walls of the cylinder. As the pins are forced into clamping engagement with the cylinder wall', the shaft4 1 feeds downwardly through the member 15, thereby causing the wedge block 14 to be forced downwardly to displace the pins 53 engaged thereby to their clamping positions. The pins are displaced radially equally in 'all directions, thereby. accurately centering the shaft within the cylinder bore, and clamping the shaft in operative position.

operative position, the mounting'member 26 is moved onto the upper end of the shaft 1 and set in a desired adjusted position. In adjusting the member 26, the key member28 is moved outwardly to its inoperative position and the vmember 26 is lowered to the desired position relative to the top of the'cylinder bore 57, as shown in Figs. 1 and l2 of the drawings, the keyV being then released io operative position lengaging a recess 81 whereby the member will be held against rotation or longitudinal movement.

The cutter-head 86 is then screwed onto the threaded extension 27. Thecutter 41 is adjusted by means of the screw 42 to cut the desired depth of cut from the cylinder wall, and the stop--screw 49 is adjusted so that the head will engage the upper end of the shaft 1 and; limit the downward movement of the carrier when the cutterA has beenv advanced a .desired distancei-nto the top of the cylinder.

Thus, assumethat the cylinder wear has left'a shoulderfof a depth of five one-thousands of anuinch which extends from the .top ofthe f cylinder 'downwardly for one half-inch to theend of thepiston ring travel. rThe cut.- ter isset to maire a cut o-f a depth equa-lv to the depth of the shouldenand the stop screw is 'adjustedso that lthe downward nio-vement of the cutter-head will-be stopped when the cutter has been made for adistance. ofronehalf inch along the cylinder wall. Y

The cutter-head 36 is thennrotated by Yof a wrench or other Isuitable tool applied uponthes'quared extension 37, the threaded Vengagement with the mounting member .e2/- tension27 causing the head to beA fed downwardly to maketh-e required cut. At the end v ofi-the cut, the lrey member 28 is moved outwardly to its inoperative position, and the cutter head 1s given a few turns-to smooth ed and Afinish the cut, the mounting member and thehead being rotated together 'without advancing thecutter relative to the cylinder Y bore. K

The, above operation is repeated for the several cylinders of an engine,fthereby ascu- `rately *removing the shoulder resulting from` wearand obtaining a true and uniform bore without the labor and expense ofdismounting .the .Cylinder block. After the initial adjust- `ment to one cylinder, the tool may be removed and reset in connection with succeeding cylin- 'dersof the same size with very .little time or.

labor'.-` `The clampingmeans affords a wide range-of adjustment so that the device'may.` be readily adjusted to cylindersl offvarious diameter, and the length of the shaft 1 'andkeyway 3 is sufficient to meet the requirement of substantially any; depth Vof cylinder. f

Specific details of construction and arrangement as herein illustrated and described are, of course, subject to modification in a l great many'ways wit-hout departing from the When the shaft 1 has been clamped in yits spirit of my invention. I therefore do not wish to be restricted to the specific details of the disclosure herein contained, but Adesire to avail myself of all modifications whichmay fall within the scope of the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is r-f 1. A counter-boring tool comprising a shaft having a" key-wayl longitudinally disposed along one end thereof and having a plurality of spaced recesses in the back of the key-way; means mounted upon the other end of the shaft and expandible withi'na cylinder bore to rigidly support the shaftin coaxial relation to the bore; a cutter-head mounting member mounted upon the shaft and provided with a securing member engaging the key-way to hold the member against rotation relative to the shaft and also engaging a desired recess to secure the member against longitudinal movement along the shaft, said securing member being movable to disengage 5 the key-Way and recess to release the mounting member for free longitudinal and rotative movement when desired; a cutter-head detachably mounted upon the mounting member and having threaded engagement there- With to feed the head axially relative to the shaft; and a cutter mounted upon the head and movable thereby to counter-bore the adjacent end oI" the cylinder bore.

2. A counter-boring tool comprising a 15 shaft having a key-Way longitudinally disposed along one end thereof and having a plurality of spaced recesses inthe back of the key-Way; means mounted upon the other end of the shaft and expandible Within a cylinder au bore to rigidly support the shaft in coaxial relation to the bore; a cutter-head mounting member mounted upon the shaft and provided with a securing member engaging the key- Way to hold the member against rotation rela- '25 tive to the shaft also engaging a desired recess to secure the member against longitudinal movement along the shai't, said securing member being movable to disengage the key- Way and recess to release the mounting mem- 30 ber for free longitudinal and rotative movement when desired; a cutter-head detachably mounted upon the mounting member and having threaded engagement therewith to feed the head axially relative to the shaft; a cutter mounted upon the head and movable thereby to counter-bore the adjacent end of the cylinder bore; and means to limit the inward axial movement of the cutter-head relative to the cylinder bore.

In Witness whereof I hereunto set my signature.

EDWARD OSTLIND.

.till 

